package study.lgf.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class SetCharacterEncodingFilter implements Filter {
	protected String encoding = null;
	protected FilterConfig filterConfig = null;
	protected boolean ignore = true;

	@Override
	public void destroy() {
		this.encoding = null;
		this.filterConfig = null;
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		if (ignore || (request.getCharacterEncoding() == null)) {
			String encoding = selectEncoding(request);
			if (encoding != null){
				request.setCharacterEncoding(encoding);
				response.setCharacterEncoding("text/html;charset=utf-8");
			}
		}
		chain.doFilter(request, response);

	}

	@Override
	public void init(FilterConfig arg0) throws ServletException {
		this.filterConfig = arg0;
		this.encoding = filterConfig.getInitParameter("encoding");
		String value = filterConfig.getInitParameter("ignore");
		if (value == null)
			this.ignore = true;
		else if (value.equalsIgnoreCase("true"))
			this.ignore = true;
		else if (value.equalsIgnoreCase("yes"))
			this.ignore = true;
		else
			this.ignore = false;

	}

	protected String selectEncoding(ServletRequest request) {

		return (this.encoding);

	}

}
